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10.12.2 update causing black screen for some…

First time I’ve seen this: an iMac user had an update from Apple pushed (10.12.2) for Sierra. Well, the screen turned black after update was done and login. Mouse moved around.

Solution was to restore back to last Time Machine backup (took several hours). Other suggestions (after the fact and not going to risk) was to blindly enter pwd. It may be that Apple’s installer has a random/long time bug that wants the user to login but the screen is black (keyboard still works, you can hear errors if you type something and hit enter). So if you get this same screen with mouse functioning, try to enter your password. It might even want your login ID and pwd.